The introduction of a new FTTH Standard in Japan

Transcription

1 The introduction of a new FTTH Standard in Japan K. Seto Hitachi Cable, Ltd. H. Takada Sumitomo Electric IEEE802.3ah 5/2002 1

2 Purpose of this presentation Dual-wavelength 100Mbps P2P bi- directional PMD is close to be standardized in Japan s s standard organization, TTC, as TS This presentation is intended to introduce the specification and the background of this standard. 2

3 What is TTC? TTC; The Telecommunication Technology Committee Established in October 1985 as a private organization in Japan Develop standards for telecommunications networks Members include; Agilent Technologies Japan, Alcatel Japan, Allied Telesis, Avaya Japan, Compaq Computer, Fujitsu, Hitachi, Hitachi Cable, IBM Japan, Intel K.K., Lucent Technologies Japan, Motorola Japan, NEC, Nippon Ericsson, NTT, Nokia Japan, Nortel Networks, Siemens K.K., Sony, Sumitomo Electric Industries, TI Japan, Unisphere Networks Details can be found at: 3

4 Background Several service providers in Japan started FTTH services based on proprietary 100BASE-FX single fiber media converter since early Total 26k FTTH subscribers by 2002/3 Deployments grew rapidly and there were needs for multi-vendor interoperability Domestic system vendors formed a MSA during 2001 and started to specify 100Mbps single fiber PMD NEC and Hitachi volunteered to bring MSA specification to TTC in 2001/11 while Sumitomo introduced the spec to IEEE802.3ah at 2002/2 Interim (kida_1_0102.pdf pdf) 4

5 Overview of TTC bi-di standard Title of the standard: TS-1000 Optical Subscriber Interface One Fiber WDM System Brief description: 100Mbps Ethernet Optical PMD and OAM intended for FTTH use PMD:: Single Fiber Dual-wavelength bi- directional 100Mbps OAM:: Proprietary short frame based OAM Remote Link, User Link Monitor, Loopback, Dying Gasp, Vendor and revision management, etc. RS MII OAM MII PCS PMA PMD MDI 5

6 TS-1000 PMD (Class S) Overview Item Transmit Power Receive Sensitivity Transmit Wavelength Downstream nm -8 dbm to -14 dbm -8 dbm to -30 dbm ( nm is also allowed) Upstream 1260 to1360nm Spectral Width (RMS) Extinction Ratio Maximum Return Remarks Pulse Mask BER < 6nm6 nm* > dB < < 7.7nm TTC JT-G957 (STM-0/STM 0/STM-1) compatible RMS on Downstream would limit the distance to approximately 7km Reducing max RMS to support 10km distance has been proposed. Longer Distance specs (Class A[20km] and Class B[30km]) are also under consideration. 6

7 TS-1000 OAM Overview Exchange OAM information Using 12Byte Short Frame Center Subscriber Functions Remote indication and inquiries Dying Gasp, Remote Fault, UTP Link (user port) Failure, etc. Loopback Test 7

8 Preamble (1Byte) (/J/K/) TTC OAM Short Frame Frame Format Command (2Byte) Up/Downstream, Version, Command ID, etc. Status (2 Byte) Power, Receive, UTP Link, Failure, etc. 12 Byte Vendor Code (3 Byte) TTC Assigned Vendor Code Model Code (3 Byte) Vendor Specific CRC (1Byte) Remarks Not compatible with IEEE802.3 Ethernet Frame Format Not usable for IEEE802.3ah EPON because there is no space for PHY-ID and/or CRC. Not applicable to IEEE802.3ah EFM 8

9 Japan s s FTTH deployments 26k k subscribers by 2002/3* NTT alone is expecting more than 600k subscribers by 2003/3* Several FTTH SPs have expressed their intention to use TTC compatible equipment in their future deployments They need standard-based equipment NOW and cannot wait for IEEE802.3ah standard Dual-wavelength Single Fiber 100Mbps PMDs, both 1310nm and 1550nm, are getting less expensive as volume grows * Nikkei Communications 5/6/2002 9

10 IEEE802.3ah actions to TTC Spec? Choice 1: Ignore and define a new 100Mbps PMD specs Pros: We can do it Our Way Cons: More works at 802.3ah, Market devide Choice 2: Use TTC as a base or reference Pros: Less work at 802.3ah Cons: TTC has no liaison with IEEE and their intention to let other organization use their spec is not known. Choice 3: Do nothing and let TTC PMD spec a de-fact spec for 100Mbps P2P signle fiber Pros: No work at 802.3ah Cons: TTC Spec does not meet some of 802.3ah objectives (i.e. BER) Choice4 :???? 10

11 Straw Poll Choice A: 802.3ah develops a 100Mbps single fiber PMD Choice B: 802.3ah specifies PMD specs identical to TTC 100Mbps single fiber PMD Choice C: 802.3ah specifies PMD specs based on TTC 100Mbps single fiber PMD Choice D: 802.3ah decides not to specify 100Mbps single fiber PMD Straw Poll results amond 802.3ah Optical PMD sub-taskforce attendees (5/21/2002 2:30pm) Choice A: 0 Choice B: 1 Choice C: 17 Choice D: 10 11